How to check firmware version for Cisco IP Phone 7940/7960

This process is a requirement before any firmware upgrade is done with a Cisco IP Phone. If you want to know more details on how to upgrade your firmware to SIP firmware, click here for my tutorial.

Boot up your phone. You can use either PoE or a power supply. I used a power supply without plugging any internet connection. It will display “Ethernet disconnected.” You will just then wait for it to boot up. It might say “Configuring CM List“.